class: center, middle, inverse, title-slide # Choropleth of discrete variables --- layout: true <div class="dk-footer"> <span> <a href="https://rfortherestofus.com/" target="_blank">R for the Rest of Us </a> </span> </div> --- class: center, middle, dk-section-title background-image:url("https://images.pexels.com/photos/7138817/pexels-photo-7138817.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260") background-size: cover # Choropleth of discrete variables --- # What is a choropleth? .pull-left[ A choropleth is a shaded area map. Choropleth can communicate two types of variable: - Discrete (categorical) variables - Continuous variables ] .pull-right[ <!-- --> ] --- class: my-turn # My turn .pull-left[ I'm going to work on improving this chart in three ways: - Ordering the legend from most to least popular streaming service - Picking alternative color palettes - Specifying custom (manual) color palettes ] .pull-right[ <!-- --> ] --- ### <span style='color:#919c4c'>Geom <svg aria-hidden="true" role="img" viewBox="0 0 512 512" style="height:1em;width:1em;vertical-align:-0.125em;margin-left:auto;margin-right:auto;font-size:inherit;fill:#919c4c;overflow:visible;position:relative;"><path d="M128,256A128,128,0,1,0,256,384,128,128,0,0,0,128,256Zm379-54.86L400.07,18.29a37.26,37.26,0,0,0-64.14,0L229,201.14C214.76,225.52,232.58,256,261.09,256H474.91C503.42,256,521.24,225.52,507,201.14ZM480,288H320a32,32,0,0,0-32,32V480a32,32,0,0,0,32,32H480a32,32,0,0,0,32-32V320A32,32,0,0,0,480,288Z"/></svg></span> and <span style='color:#f5c04a'>Guide <svg aria-hidden="true" role="img" viewBox="0 0 640 512" style="height:1em;width:1.25em;vertical-align:-0.125em;margin-left:auto;margin-right:auto;font-size:inherit;fill:#f5c04a;overflow:visible;position:relative;"><path d="M497.941 225.941L286.059 14.059A48 48 0 0 0 252.118 0H48C21.49 0 0 21.49 0 48v204.118a48 48 0 0 0 14.059 33.941l211.882 211.882c18.744 18.745 49.136 18.746 67.882 0l204.118-204.118c18.745-18.745 18.745-49.137 0-67.882zM112 160c-26.51 0-48-21.49-48-48s21.49-48 48-48 48 21.49 48 48-21.49 48-48 48zm513.941 133.823L421.823 497.941c-18.745 18.745-49.137 18.745-67.882 0l-.36-.36L527.64 323.522c16.999-16.999 26.36-39.6 26.36-63.64s-9.362-46.641-26.36-63.64L331.397 0h48.721a48 48 0 0 1 33.941 14.059l211.882 211.882c18.745 18.745 18.745 49.137 0 67.882z"/></svg></span> order and factors We use `factors` to control the order of both geoms and guides. .pull-left[ - Default (alphabetical) ordering <img src="data:image/png;base64,#02_06_choropleth-for-discrete-variables_files/figure-html/unnamed-chunk-6-1.png" width="100%" /> ] .pull-right[ - Reordered by frequency <img src="data:image/png;base64,#02_06_choropleth-for-discrete-variables_files/figure-html/unnamed-chunk-7-1.png" width="100%" /> ] --- # `NA` values in factors `NA` is always placed at the end of a factor's levels. The only way to change this is with fct_explicit_na() .pull-left[ - Default behaviour of a factor with NA values <img src="data:image/png;base64,#02_06_choropleth-for-discrete-variables_files/figure-html/unnamed-chunk-8-1.png" width="100%" /> ] .pull-right[ ```r data %>% fct_explicit_na(vore, "Unknown")) %>% ... ``` <img src="data:image/png;base64,#02_06_choropleth-for-discrete-variables_files/figure-html/unnamed-chunk-10-1.png" width="100%" /> ] --- class: inverse ## Your turn .pull-left[ Use the `your-turn.R` script in `02_06` to make this map. - Use the custom colors. - Ensure the guide is ordered by size of region. - Add a title to the guide. ] .pull-right[ <img src="data:image/png;base64,#02_06_choropleth-for-discrete-variables_files/figure-html/unnamed-chunk-11-1.png" width="100%" /> ]